When you quickly jerk a cart forward that has a ball resting in the middle, the
A) front of the cart hits the ball.
B) back of the cart hits the ball.
C) neither, for the ball rides along in the middle as the cart moves forward.
D) All of the above depending on how quickly the cart is pulled.
Answer: B
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The second step in the precipitation-hardening process is to _________the alloy to maintain a uniform distribution of atoms in the grains at low temperature.
Fill in the blank(s) with the appropriate word(s).
If you measure the width of an outdoor barn with a steel tape on a very cold day, your measured width will be
A) a bit short. B) a bit long. C) the same as on an average-temperature day.
When voltage is stepped up in a transformer, current is stepped down. But Ohm's law tells us that greater voltage means greater current, not less current. How then can current be lower when voltage is increased?
A) Current in the secondary is lower when compared to the greater current drawn by the primary. B) Ohm's law applies to the circuit connected to the secondary, not to the transformer. C) both of these D) neither of these
The most important force between a proton and a neutron is the ______________ force
a. strong nuclear b. quark c. electromagnetic d. gravitational